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• FFmpeg video thumbnail colors look off (dull, faded, desaturated)

  21 juin 2022, par schneikai

  I try to generate video thumbnails with FFmpeg but the colors of the generated JPG file look very different from the video. Here is a screenshot I took while running the video in a player and the other picture is a JPG generated with FFmpeg. The video was recorded with an iPhone 12.

  


  Screenshot from Movie :

  


  

  


  Thumbnail from FFmpeg :

  


  

  


  Here´s a link to the mov-file : https://www.dropbox.com/s/udowplvfspxq6ag/IMG_8357.MOV?dl=1

  


  I use the following FFmpeg options : -y -vframes 1 -f image2

  


  My FFmpeg Version is

  


  ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
configuration: --prefix=/usr/local/Cellar/ffmpeg/5.0.1_1 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
libavutil      57. 17.100 / 57. 17.100
libavcodec     59. 18.100 / 59. 18.100
libavformat    59. 16.100 / 59. 16.100
libavdevice    59.  4.100 / 59.  4.100
libavfilter     8. 24.100 /  8. 24.100
libswscale      6.  4.100 /  6.  4.100
libswresample   4.  3.100 /  4.  3.100
libpostproc    56.  3.100 / 56.  3.100


  


  Thanks so much for pointing me in the right direction.

  


• Converting MTS to MP4 using FFmpeg results in no/missing audio

  17 mars 2021, par tenninebt

  I have a few videos coming from a Sony Nex-5N. Basically they are "compiled" in an AVCHD. The format that is inside is MTS. I'm able to convert the videos losslessly but the resulting MP4 has no audio.

  


  ffmpeg -i 20201205150626.MTS -c:v copy -c:a copy -an -f mp4 20201205150626.MP4 


  


  The result is no audio. Then I tried to select explicitly the audio track using -map 0:a:1 but it says that it does not matches no streams. Please have a look at the following extract :

  


  > ffmpeg -i 20201205150626.MTS -c:v copy -c:a copy -map 0:a:1 -an -f mp4 20201205150626.MP4 
ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, mpegts, from '20201205150626.MTS':
  Duration: 00:00:09.60, start: 1.020000, bitrate: 26296 kb/s
  Program 1 
    Stream #0:0[0x1011]: Video: h264 (High) (HDPR / 0x52504448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
    Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s
    Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080
Stream map '0:a:1' matches no streams.
To ignore this, add a trailing '?' to the map.



  


  I can see an audio stream, and its index is 1. I have no clue what is happening.

  


• FFMPEG Scale video without filtering

  24 août 2023, par honi

  I am interested in scaling a video to a larger size without applying any filter or anything. The output video should look very pixelated. How do I do this in FFMPEG ?

  



  On the suggestion of Ronald S. Bultje, I am using the neighbor flag. I have also decided to use the rawvideo codec to avoid compression.

  



  The current command I am running is

  



  ffmpeg -i vid.avi -s 800x800 -sws_flags neighbor -sws_dither none -vcodec rawvideo vid2.avi


  



  The command line output of that command is

  



  ffmpeg version 2.7 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-avresample --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype --enable-libfribidi --disable-indev=jack --disable-outdev=xv --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --enable-vda --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, avi, from 'vid.avi':
  Duration: 00:00:25.00, start: 0.000000, bitrate: 226 kb/s
    Stream #0:0: Video: rawvideo, pal8, 80x80, 206 kb/s, 4 fps, 4 tbr, 4 tbn, 4 tbc
File 'vid2.avi' already exists. Overwrite ? [y/N] y
Output #0, avi, to 'vid2.avi':
  Metadata:
    ISFT            : Lavf56.36.100
    Stream #0:0: Video: rawvideo, pal8, 800x800, q=2-31, 200 kb/s, 4 fps, 4 tbn, 4 tbc
    Metadata:
      encoder         : Lavc56.41.100 rawvideo
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
frame=  100 fps=0.0 q=0.0 Lsize=   62608kB time=00:00:25.00 bitrate=20515.4kbits/s    
video:62600kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.012614%